Telegraphic receiver.



PATENTBD AUG. 8, 1905.

A. MUIRHEA D. TELBGRAPHIG RECEIVER.

APPLICATION FILED 11110.13, 1901.

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- corders, wherein a coil is delicately suspendvided with a tail 40. To this tail or other UNITED STATES PATENT OFFICE.

ALEXANDER MUIRHEAD, OF SHORTLANDS, ENGLAND.

TELEGRAPHIC RECEIVER.

No. 796,597. Specification of Letters Patent. Patented Aug. 8, 1905. Application filedDecember 13,1901. Serial No. 85,749.

To all whom, it may concern.-

Be it known thatI, ALEXANDER MUIRHEAD, a subject of His Majesty the King of Great Britain, residing at Shortlands, in the county of Kent, England, have invented new and useful Improvements in Telegraphic Receivers, of which the following is a specification.

My present invention relates to telegraphic receivers of that class known as siphon-reand to the earth.

of which is common to the two terminals 8 9 of the relays 14 and 15 and the other pole of which is common to the opposite terminals 6 7 thereof.

The diagram shows the arrangement and connections in their normal positions-that is, when no signaling impulses are arriving through the coil 26. The conductive fiber 41 is then between the contacts 42 43, but touching neither of them, and the retransmittingcable 2 is grounded through tongue L, terminals 8 and 9, and tongue E. If now an arriving impulse oscillates the coil 26 in one direction, the cradle 35 and its tail 40 will swing correspondingly and the conductive fiber 41 be broughtinto contact with one stop-say 42. Thereupon a completed circuit is traceable from one pole of the part 3 of the divided battery 3 4 through contact 42, conductive fiber 41, cradle 35, metallic fibers 36, and coils of the relays 15 and 14 to the opposite pole of part 3 of battery 3 4 and the condenser 16 as a shunt. The effect of this will be that one of the relay-tongues say the oneL-will move from terminal 8 to the one 7 thereby putting the copper pole of the battery 5 to cable 2, the zinc pole of the battery being to earth through the tongue E. This condition of atfairs will continue until coil 26 returns and connection is broken at the point 42, whereupon tongue L will return to the position shown in the diagram. When the coil 26 oscillates in the opposite direction, similar movements occur, the circuit of the battery-half 4 being completed through stop 43 and the coils of the two relays 15 14 and condenser 16, as before, resulting in the movement of the tongue E from the terminal 9 to the one 6, whereupon the copper pole of the battery 5 will be conected to earth and the zinc pole to the cable.

In the illustration vibration is imparted to the fiber or conductive wire 41 by reason of its being connected to the spring-mounted armature of the vibrator 39. This vibration will prevent the said fiber from sticking to the contacts.

Means may be provided for adjusting or regulating the distance of the two contacts 42 and 43 fromthe fiber 41. The drawing shows the contact mounted upon a rotatory base which is adapted to be turned bya tangented or pivoted in a magnetic field. To this coil an inking-siphon is usually attached, or when designed for relaying or retransmitting from one cable-circuit to another a metallic tongue mounted on the said coil and making contact between the two terminals of a local or retransmitting circuit has been substituted for the said siphon.

My present objects are to provide a novel form of contact in lieu of the said tongue and to effect the other improvements hereinafter described and claimed.

The annexed drawing illustrates diagrammatically my invention.

The numeral 26 represents the recorder-coil, which, as will be well understood, is in electrical connection with the telegraph-cable.

35 is the siphon-cradle, attached to stretched metallic fibers 36 36. When required, the cradle may carry an ordinary inking-siphon 37, so that the instrument may serve as a combined siphon-recorder and relay. Non-conductive fibers 38 38 connect the coil 26 with the cradle 35 in the usual way.

39 is the usual vibrator.

According to my present invention instead of using a metallic tongue as the relay-contact I employ a conducting fiber 41 of phosphorbronze or the like as contact-maker. In the diagram the siphon-cradle 35 is shown propart of the cradle the fiber 41 is attached. The other end of the fiber 41 may be connected to the armature of the vibrator 39.

At an intermediate point the fiber 41 passes between two relay-contacts 42 43, carried on insulated bases 44 and 45. These contacts or their bases constitute the terminals of the local or relay circuits, as shown, and the fiber 41 is included in the same circuit. In the illustrated example they form part of the circuit of the local battery 3 4. ln this circuit there are two local relays 14 and 15 and a condenser 16 as a shunt. The tonguesL and Eof these two relays are connected, respectively, to the cable 2, into which retransmission is effected,

5 is the retransmitting line-battery, one pole screw 46. contact is moved in unison nearer to or farther from the said fiber 41.

What I claim, and desire to secure by Letters Patent of the United States, is-

1. The combination with the oscillating receiver-coil, of a stretched conductive wire movable therewith, means serving as supports for said wire, contacts against which the wire works and asignal-circuit connected with such contacts.

2. The combination in a cable-relay, of a coil, a stretched conductive wire movable therewith as contact-maker, means serving as supports for said wire, a relay-contact on each side of said wire and means serving to impart vibration to said conductive wire for the purpose of preventing the wire from sticking to said relay-contacts.

3. The combination, in a cable-relay, of a Thus by turning the said base each coil, a stretched conductive wire movable therewith as contact-maker, means serving as supports for said wire, relay-contacts between which said conductive wire passes, and means serving to adjust the distance of the contacts from said conductive wire.

4. The combination, in a cable-relay, of a coil, a stretched conductive wire movable therewith as contact-maker, means serving as supports for said wire, relay-contacts between which said conductive wire passes, and a retransmitting-circuit in which said relay-contacts are included.

In testimony whereof I have hereunto subscribed my name.

ALEXANDER MUIRHEAD.

Witnesses:

A. F. SPooNER, J. S. WITHuRs. 

